Crossword Genius

Party’s rejected a constituent for boozy tipples (4)

Ross

I believe the answer is:

soda

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'constituent for boozy tipples' is the definition.
I can't tell whether this definition defines the answer.

'party's rejected a' is the wordplay.
'party's' becomes 'dos' (do is a kind of party).
'rejected' says the letters should be written in reverse.
'dos' backwards is 'sod'.
'sod'+'a'='SODA'

Can you help me to learn more?

(Other definitions for soda that I've seen before include "Variety of pop" , "kind of water" , "Alkaline substance used in cleaning, drinks etc" , "Splash served with some spirits" , "Accompaniment to whisky" .)

I've seen this clue in The Telegraph.
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